exam Maths Puzzle Numerical Ability

graph
3x-6y=9
x-2y=3

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exam Other Question

(7x-5)-(3x+7)

(2xsquared-3x+1)-(5xsquared-3x+10)

(8x+6)-(10x+16)+(4x-6) factor the polynomial completely,clearly show the GCF

x^2+x+12

This is the answer I got from atempting this problem::

NF (Not factorable)